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Started By
Message
I come to my OB brethren in seek of wise guidance (AR15 BUILD)
Posted on 1/28/14 at 2:26 pm
Posted on 1/28/14 at 2:26 pm
I am building my first AR. Here's my list of parts:
PSA "Stealth" stripped lower receiver
PSA Classic LPK
BCM 16" M4 (SOCOM) upper receiver group
BCM Bolt Carrier Group (MPI) - Auto
BCMGUNFIGHTER ambidextrous charging handle
KNS anti-rotational pinset
I assembled the lower last night, after driving a punch into a roll pin, having the detent shoot out about a dozen times, losing said detent pin, finding said detent pin, etc.
So I have a complete lower, and my upper with out a rail on it.
I want to install this rail on my upper DD AR15 Lite Rail 10.0
Here's the upper as well for reference to the FSB/barrel nut/delta ring LINK
Here's where I need your suggestions/help:
I have not tried to remove the FSB/barrel nut/delta ring yet. I have heard that it is very difficult to remove these parts on a BCM upper.
I was told to take it to Jim's and get them to do it. I'd really like to go through the process myself, but I went by there today anyway to inquire. They told me that it would take at least a month. I said frick that. I don't want to wait a damn month. I think I can do it.
WWYD in my situation?
Do you really have to "burn"/grind these off? Is it really impossible to drive out the pins and torque the nut off?
For your assistance:
PSA "Stealth" stripped lower receiver
PSA Classic LPK
BCM 16" M4 (SOCOM) upper receiver group
BCM Bolt Carrier Group (MPI) - Auto
BCMGUNFIGHTER ambidextrous charging handle
KNS anti-rotational pinset
I assembled the lower last night, after driving a punch into a roll pin, having the detent shoot out about a dozen times, losing said detent pin, finding said detent pin, etc.
So I have a complete lower, and my upper with out a rail on it.
I want to install this rail on my upper DD AR15 Lite Rail 10.0
Here's the upper as well for reference to the FSB/barrel nut/delta ring LINK
Here's where I need your suggestions/help:
I have not tried to remove the FSB/barrel nut/delta ring yet. I have heard that it is very difficult to remove these parts on a BCM upper.
I was told to take it to Jim's and get them to do it. I'd really like to go through the process myself, but I went by there today anyway to inquire. They told me that it would take at least a month. I said frick that. I don't want to wait a damn month. I think I can do it.
WWYD in my situation?
Do you really have to "burn"/grind these off? Is it really impossible to drive out the pins and torque the nut off?
For your assistance:
This post was edited on 1/28/14 at 2:39 pm
2
Posted on 1/28/14 at 2:31 pm to DirtyMikeandtheBoys
The hardest part will be removing the front site/gas block. You will have to grind the pin on it off. Get on youtube and find a video on it.
Posted on 1/28/14 at 2:32 pm to DirtyMikeandtheBoys
That girl has beautiful lip
Posted on 1/28/14 at 2:35 pm to Bleeding purple
Do I need to remove that 2nd pic
Posted on 1/28/14 at 2:44 pm to DirtyMikeandtheBoys
I did the exact same thing with a BCM upper on my build.
The front site isnt that hard, just need to grind it off while being careful not to gouge the barrel.
Taking the barrel nut off however can prove to be difficult as BCM really torque's those things down. I tried to go the cheap route and just wedge the upper between two blocks of wood and by the time I broke nut loose I cracked the upper housing. So then I had to buy a replacement upper + the upper block vise to hold it properly.
The front site isnt that hard, just need to grind it off while being careful not to gouge the barrel.
Taking the barrel nut off however can prove to be difficult as BCM really torque's those things down. I tried to go the cheap route and just wedge the upper between two blocks of wood and by the time I broke nut loose I cracked the upper housing. So then I had to buy a replacement upper + the upper block vise to hold it properly.
Posted on 1/28/14 at 2:47 pm to Tbooux
When ya'll say grind?
do you mean take a dremel/grinder to the actual FSB? Or grind the pins a little and then drive them out?
do you mean take a dremel/grinder to the actual FSB? Or grind the pins a little and then drive them out?
Posted on 1/28/14 at 2:49 pm to DirtyMikeandtheBoys
quote:
grind the pins a little and then drive them out
Posted on 1/28/14 at 3:09 pm to Tbooux
The barrel nut will be the toughest to remove.
Torque the new nut to 30-80lbs. Make sure you use non graphite anti seize on the barrel nut threads.
If you don't have a vise, torque wrench, or a vise block just take it to someone who does.
Eta: try barking irons for a faster turn around.
A lot a folks just cut the fsb and leave them on....
LINK
LINK
Torque the new nut to 30-80lbs. Make sure you use non graphite anti seize on the barrel nut threads.
If you don't have a vise, torque wrench, or a vise block just take it to someone who does.
Eta: try barking irons for a faster turn around.
A lot a folks just cut the fsb and leave them on....
LINK
LINK
This post was edited on 1/28/14 at 3:31 pm
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